diff --git a/htdocs/comm/action/index.php b/htdocs/comm/action/index.php
index 381c3e7cc28..e178bcdd468 100644
--- a/htdocs/comm/action/index.php
+++ b/htdocs/comm/action/index.php
@@ -1243,7 +1243,7 @@ function show_day_events($db, $day, $month, $year, $monthshown, $style, &$eventa
     $i=0; $nummytasks=0; $numother=0; $numbirthday=0; $numical=0; $numicals=array();
     $ymd=sprintf("%04d",$year).sprintf("%02d",$month).sprintf("%02d",$day);
 
-    $nextindextouse=count($colorindexused);	// At first run this is 0, so fist user has 0, next 1, ...
+    $nextindextouse=is_array($colorindexused)?count($colorindexused):0;	// At first run this is 0, so fist user has 0, next 1, ...
     //print $nextindextouse;
 
     foreach ($eventarray as $daykey => $notused)